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Registro Completo |
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Biblioteca(s): |
Embrapa Pantanal; Embrapa Trigo. |
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Data corrente: |
21/08/1995 |
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Data da última atualização: |
09/07/2010 |
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Autoria: |
WANG, J. Y. |
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Título: |
A critique of the heat unit approach to plant response studies. |
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Ano de publicação: |
1960 |
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Fonte/Imprenta: |
Ecology, v.41, n.4, p.785-790, Oct. 1960. |
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Idioma: |
Inglês |
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Conteúdo: |
The "heat unit approach" in use for over two centuries, is a scheme for studying plant-temperature relationships by the accumulation of daily mean temperatures above a certain threshold temperature during the growing season. If a plant has a base temperature of 40 F and the mean temperature on a given day is 55 F, the difference in degrees for that day is termed "degree-days" or "heat units". In this example, we would have 15 degree-days. If 1200 degree-days are required for maturity, the plant should reach maturity by the time 1200 degree-days have been accumulated. This sum required for a particular crop variety has been assumed by heat unit workers to be a constant value and is termed the varietal constant. By knowing the varietal constant, users predict the date on which their crops should be harvested. This linear relationship, known as the "remainder index method," gave rise to a number of expressions, such as "degree-days," "heat units," "growing degree-days," "growth units," and others relating plant responses to season thermal levels. |
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Palavras-Chave: |
Plant. |
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Thesagro: |
Climatologia; Planta; Temperatura. |
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Thesaurus Nal: |
climatology; temperature. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01543naa a2200193 a 4500
001 1785694
005 2010-07-09
008 1960 bl --- 0-- u #d
100 1 $aWANG, J. Y.
245 $aA critique of the heat unit approach to plant response studies.
260 $c1960
520 $aThe "heat unit approach" in use for over two centuries, is a scheme for studying plant-temperature relationships by the accumulation of daily mean temperatures above a certain threshold temperature during the growing season. If a plant has a base temperature of 40 F and the mean temperature on a given day is 55 F, the difference in degrees for that day is termed "degree-days" or "heat units". In this example, we would have 15 degree-days. If 1200 degree-days are required for maturity, the plant should reach maturity by the time 1200 degree-days have been accumulated. This sum required for a particular crop variety has been assumed by heat unit workers to be a constant value and is termed the varietal constant. By knowing the varietal constant, users predict the date on which their crops should be harvested. This linear relationship, known as the "remainder index method," gave rise to a number of expressions, such as "degree-days," "heat units," "growing degree-days," "growth units," and others relating plant responses to season thermal levels.
650 $aclimatology
650 $atemperature
650 $aClimatologia
650 $aPlanta
650 $aTemperatura
653 $aPlant
773 $tEcology$gv.41, n.4, p.785-790, Oct. 1960.
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Registro original: |
Embrapa Pantanal (CPAP) |
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Tipo/Formato |
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Registro |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Suínos e Aves. Para informações adicionais entre em contato com cnpsa.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Suínos e Aves. |
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Data corrente: |
06/10/2015 |
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Data da última atualização: |
26/07/2016 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
A - 1 |
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Autoria: |
ZANELLA, J. R. C.; SCHAEFER, R.; GAVA, D.; HAACH, V.; CANTAO, M. E.; COLDEBELLA, A. |
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Afiliação: |
JANICE REIS CIACCI ZANELLA, CNPSA; REJANE SCHAEFER, CNPSA; DANIELLE GAVA, CNPSA; VANESSA HAACH, UNOESC; MAURICIO EGIDIO CANTAO, CNPSA; ARLEI COLDEBELLA, CNPSA. |
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Título: |
Influenza A virus infection in Brazilian swine herds following the introduction of pandemic 2009 H1N1. |
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Ano de publicação: |
2015 |
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Fonte/Imprenta: |
Veterinary Microbiology, v. 180, n. 1-2, p. 118-122, 2015. |
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DOI: |
http://dx.doi.org/10.1016/j.vetmic.2015.08.021 |
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Idioma: |
Inglês |
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Conteúdo: |
Influenza A virus (FLUAV) infections are endemic in pork producing countries worldwide but in Brazil it was not considered an important pathogen in pigs. Since the emergence of 2009 pandemic H1N1 (H1N1pdm) FLUAV, many outbreaks of respiratory disease were observed in pig herds. The aim of this study was to evaluate FLUAV infection in swine in 48 pig farms located in seven Brazilian states with previous reports of influenza-like signs by clinical, serological and virological cross-sectional studies. Serological results showed that pigs from all farms had anti-influenza antibodies by NP-ELISA. Antibodies to H3N2, H1N2 and H1N1pdm were detected by HI in pigs from 24 farms. Co-infection with two or more FLUAV subtypes was detected in pigs in seven of those 24 farms. Detection of FLUAV in nasal swabs and oral fluids by RT-qPCR indicated a global concordance >81% for the two biological samples. Moreover, our results show that H1N1pdm, H1N2 and H3N2 viruses are widespread in Brazilian pig herds. The monitoring of FLUAV emergence and evolution in pigs is urgent, as well the study of the pathogenesis of Brazilian isolates, aiming to control influenza in pigs |
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Palavras-Chave: |
H1N1. |
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Thesagro: |
Imunização; Soro; Suíno. |
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Thesaurus NAL: |
Brazil; Influenza A vírus; Serology; Swine. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01988naa a2200289 a 4500
001 2025857
005 2016-07-26
008 2015 bl uuuu u00u1 u #d
024 7 $ahttp://dx.doi.org/10.1016/j.vetmic.2015.08.021$2DOI
100 1 $aZANELLA, J. R. C.
245 $aInfluenza A virus infection in Brazilian swine herds following the introduction of pandemic 2009 H1N1.$h[electronic resource]
260 $c2015
520 $aInfluenza A virus (FLUAV) infections are endemic in pork producing countries worldwide but in Brazil it was not considered an important pathogen in pigs. Since the emergence of 2009 pandemic H1N1 (H1N1pdm) FLUAV, many outbreaks of respiratory disease were observed in pig herds. The aim of this study was to evaluate FLUAV infection in swine in 48 pig farms located in seven Brazilian states with previous reports of influenza-like signs by clinical, serological and virological cross-sectional studies. Serological results showed that pigs from all farms had anti-influenza antibodies by NP-ELISA. Antibodies to H3N2, H1N2 and H1N1pdm were detected by HI in pigs from 24 farms. Co-infection with two or more FLUAV subtypes was detected in pigs in seven of those 24 farms. Detection of FLUAV in nasal swabs and oral fluids by RT-qPCR indicated a global concordance >81% for the two biological samples. Moreover, our results show that H1N1pdm, H1N2 and H3N2 viruses are widespread in Brazilian pig herds. The monitoring of FLUAV emergence and evolution in pigs is urgent, as well the study of the pathogenesis of Brazilian isolates, aiming to control influenza in pigs
650 $aBrazil
650 $aInfluenza A vírus
650 $aSerology
650 $aSwine
650 $aImunização
650 $aSoro
650 $aSuíno
653 $aH1N1
700 1 $aSCHAEFER, R.
700 1 $aGAVA, D.
700 1 $aHAACH, V.
700 1 $aCANTAO, M. E.
700 1 $aCOLDEBELLA, A.
773 $tVeterinary Microbiology$gv. 180, n. 1-2, p. 118-122, 2015.
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Embrapa Suínos e Aves (CNPSA) |
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